BUG=angleproject:947

TEST=angle_unittests, angle_end2end_tests

Change-Id: Id1afd7630d9720b6701225b7abf1ce4a3bf528b6
Reviewed-on: https://chromium-review.googlesource.com/260232Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
Tested-by: Olli Etuaho <oetuaho@nvidia.com>